Depessimize bits of CC Mode for long C macros.
* lisp/progmodes/cc-engine.el (c-end-of-macro): Check for being in a degenerate zero length "macro", when setting the macro cache. (c-determine-+ve-limit): Add in a missing goto-char form for when start-pos is non-nil. (c-back-over-member-initializers): Add a search limit parameter. * lisp/progmodes/cc-fonts.el (c-get-fontification-context): Add a search limit to c-go-up-list-backward. (c-font-lock-cut-off-declarators): Add a search limit to c-back-over-member-initializers. * lisp/progmodes/cc-mode.el (c-before-change-check-unbalanced-strings): Don't set c-new-END to the end of logical line (which might be a long macro). (c-after-change-mark-abnormal-strings): Calculate end-hwm in place of the setting of c-new-END (above). Use this as a search limit rather than c-new-END.
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